Originally Posted by
unterhausen
when I tried charging my 800 with my Luxos, both were new to me. I couldn't really get it to work reliably. Probably user error in combination with a lot of climbing
I just happen to have my Luxos U instructions handy. "
Permanent USB charging with more than 100ma is only possible when all light functions are off. When the cache battery is charged, simultaneous charging and use of the light function is
temporarily possible." note the highlights are in the instructions.
It goes on to say the duration depends on hub dynamo, speed and load demand of the device being charged.